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Probing the Pomeron spin-flip with Coulomb-nuclear interference

Oct 10, 2019

17 pages

e-Print:

1910.04799 [hep-ph]

Report number:

USM-TH-363

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Abstract: (arXiv)

Brand-new high-precision data for single-spin asymmetry

A_N(t)

in small angle elastic

pp

scattering from the fixed target experiment HJET at BNL at

E_{lab}=100

and 255 \mbox{ GeV}, as well as high energy STAR measurements at \sqrt{s}=200 \mbox{ GeV}, for the first time allowed to determine the spin-flip to non-flip ratio

r_5(t)

in a wide energy range. We introduced an essential modification in the Coulomb-nuclear interference (CNI) mechanism, missed in previous analyses. It can be formulated either as a modification of the Coulomb phase, which is much larger for the spin-flip compared with non-flip amplitudes, or as absorptive corrections to the electromagnetic interaction of hadrons. The Regge analysis singles out the Pomeron contribution to the spin-flip amplitude, which steeply rises with energy. We found the spin-flip to non-flip ratio of the Pomeron amplitudes to be nearly

-10\%

, steeply rising with energy in accordance with theoretical expectations.

Note:

This paper is withdrawn due to shortcomings and the updated paper will be submitted as new because of significant changes in the concept of the paper

24.70.+s
25.40.Cm
11.55.Jy
34.80.Nz
energy: high
p p: elastic scattering
pomeron
interference
Coulomb
Brookhaven Lab

References(20)

Figures(7)

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